Blast furnace



June 26, 1923.

J. KENNEDY BLAST FURNACE Filed Jari 1921 2 'sheets-,sheet i INVENTOH.

June 26, 1923.

BLAST FURNACE Filed Jah.

26 1921 2 SheetSfSheet 2 Patented nlune 26, i923.

Uhllmll STA ortica.

BLAST FURNACE.

Application filed January 26, 1921. Serial No. 440,083.

To aZZ, whom t may concern.' i

Be it known that l, JULIAN KENNEDY, re-

siding at Pittsburgh, in the county of Allegheny and State of Pennsylvania, have invented a new and useful improvement in Blast Furnaces, of which the following is a full, clear, and exact description, reference being had to the accompanying drawings, iiormin g part of this specification, inl which- Figure l is a. iront elevation of a portion oi a blast furnace showing the iron notch of the furnace and having my invention applied thereto; i

Figure 2 is a transverse vertical section oi the parts shown in Figure l;

Figure 3 is a section on the line llllll of Figure l;

Figures 4L and 5 are longitudinal sections taken in planes at right angles to. each other of one of the notch wall coolers.

My invention has relation to blast furnaces, andinore particularly vto that portion of a blast furnace which contains the usual iron notch through which the molten iron is discharged from the hearth of the Jfurnace. The wall of the furnace adjacent to and surrounding the notch has usually been protected by means of a cooling plate having means for circulating a cooling fluid therethrough. This plate has, however, proved insufficient in practice to prevent the cutting away ot the hearth wall adjacent to the notch, such wall being of a thickness too great to permit it to be e'liciently cooled by f the cooling action/ofthe said external coolino' olate.

y invention is designed to provide supplemental cooling means which will be effective in protecting the portion of the hearth wall of the 'furnace above the iron notch, and where the cutting is most severe, owing to the intense heat in the hearth of the furnace and to the action of the furnace tuyeres.

The nature of my invention will be best understood by reference to the accompanying drawings, in which I have shown a preferred embodiment thereof and which will now be described, it being premised, however, that various changes can be made in the details of construction, arrangement and combination of the various parts, without departing from the spirit and scope oit' my inventionas delined in the appended claims.

In these drawings, the numeral 2 designates a portion of the hearth wall of a blast furnace stack. 3 designates the usual iron notch. 4 is the usual cooling plate surrounding said notch and provided with watercirculating pipes 5; and 6 designates some of the usual bosh plate coolers which are inserted in the bosh wall of the furnace above the hearth.

ln accordance with my invention, I provide a supplemental cooler or coolers which are arranged between the iron notch and the bosh plate coolers, two ot the supplemental coolers being shown in the drawings. Each oi" these coolers consists of a box 7, preferably somewhat wedge-shaped in cross sec'- tion, to facilitate its insertion and removal. This box is provided with water-circulating connections 8. The boxes are inserted into the hearth-wall at .a point adjacent tothe upper end ot the cooling plate 4, extending downwardly and inwardly into said wall in the direction of the iron notch. The exact angle of these plates, together with the extent of their downward projection, may be varied at will. The upper end portions of the plates preferably project outwardly into accessible positions, being provided with suitable eyes 9, to facilita-te their removal. The boxfis preferably provided with an interior baffle wall 10, which is so placed as to cause the c'old water entering the box to pass downwardly to a point near the lower end. of the box, before escaping into the main chamber of the box. Preferably, this baffle wall will be provided with one or more small openings ll. at its extreme upper portion, so as to permit of the escape of any steam which may be formed at the incoming side of the baille and permit this steam to readily pass away through the offtake circulating pipe.

Usually two of the supplemental coolers, arranged as described, one at each side of the vertical center line of the iron notch, would be suflibient, but l do not desire to limit myself in this respect, as any desired number of these plates may be used. The size and construction may also be changed. It will be noted that by the location of the plates as shown and described, the circulating connections are brought well away from the iron notch, so that they are not exposed to intense heat when the :furnace is tapped and are also at a sutlicient distance to be protected against hot metal splashing thereon. At the same time, the coolers are brought into that portion of the hearth wall where the cutting action is most severe and where they are the most effective.

l I claim:

l. The combination with a blast furnace having an iron notch, of a cooler seated in ythe wall of the furnace directly above and adjacent said notch, and a supplemental cooler seated in said wall intermediate said first-mentioned cooler and notch, said supplemental cooler being slightly to one side of the vertical plane of said notch and extending obliquely downward toward the notch, substantially as described.

2. The combination witha blast furnace having an iron notch, of a cooler seated in the wall of the furnace directly above and adjacent said notch, and a pair of supplemental coolers s'eated in said wall intermediate said first-mentioned cooler and notch, said supplemental coolers being arranged on opposite sides of the vertical plane of said notch and extending obliquely downward toward the notch, substantially as described.

3. The combination with a blast furnace having an iron notch and an external cooling plate surrounding said notch, of a cooling member inserted in the wall of the furnace adjacent the upper edge of said plate and directly above said notch, and a Asupplemental cooling member seated in said wall intermediate said first-mentioned ecoling member and notch, said supplemental cooling member being slightly to one side of the vertical plane of said notch, substantially as described.

4. The combination with a blast furnace having an iron notch and an external cool ingplate surrounding said notch, of a cooling member inserted in the wall of the furnace adjacent the upper edgeof said plate and directly abovev said notch, and a pair of supplemental cooling members seated in said wall intermediate said first-mentioned cooling member and notch, said supplemental cooling members being arranged on opposite sides of the vertical plane of said tween the iron notch and the bosh plate coolers, said supplemental cooling means extending obliquely downward toward the notch, substantially as described.

6. The combination with a blast furnace having an iron notch, of an external cooling plate surrounding said notch and supplemental cooling means located in the wall of the furnace above said notch and extending behind said cooling plate, substantially as described. v

7. The combination with a blast furnace having` an iron notch, of an external cooling plate surrounding said notch and supplemental cooling` means located in the wall of the furnace above said notch and extending behind said cooling plate, one end of said cooling means projecting outwardly` from thc furnace and having means for conducting cooling fluid thereto, substantially as described.

8. The combination with a blast furnace having an iron notch, of an external cooling plate Surrounding said notch andsupplemental cooling means located in the wall of the furnace above said notch and extending behind said cooling plate, one end of said cooling means projecting outwardly above the external cooling plate and having means for conducting cooling Huid `thereto,`

substantially as described.

In testimonyV whereofI have hereunto set my hand.

JULIAN KENNEDY.'

upper edge of the cooling plate and be- 

